what is the proof of the existence of dark matter? i mean...(continued)?

Question

scientists formulated the temperature of dark matter and everything else but could the dark matter theory, which says that it makes up 90% of the universe, could be wrong? that is if it really is present?

Answer 1

Well, not speculating on whether dark matter is present or not, we know, from observation that there is something capable of altering the rotation curves of galaxies, causing gravitational lensing, affecting the flow of interstellar gases (including one case, VIRGOHI21, where a bunch of diffuse hydrogen in a region of no stars whatsoever is behaving as though it had a rather substantial mass despite the complete absence of any stars), and altering the large-scale structure of the universe, in precisely the same way that gravity does, and say, electromagnetic forces do not. We know that this mysterious gravity-like force is being exerted by objects that do not emit or absorb light, because we would be able to see it if it was. The simplest explanation for this phenomena is that it is in fact gravity, and that this gravity is being caused by the presence of large amounts of matter that we cannot see - i.e. dark matter. I suggest that you look at the wikipedia articles on this subject for more details.

Answer 2

DARK MATTER
The universe, apart from containing normal matter (dust, rocks, stars, galaxies, planets etc.) contains dark matter. These are the stars which were too small to ignite. All galaxies contain a certain amount of dark matter. These are referred to as Massive Compact Halo Objects (MACHOs). MACHOs have been detected through their gravitational effect on light, although there is no definitive knowledge of exactly what they are. The matter which we know is called baryonic matter but the dark matter can be considered a non- baryonic kind of matter. So far what we have found out in connection with dark matter is both baryonic and non baryonic. The baryonic dark matter can be considered as stars that do not give out sufficient light e.g. Brown dwarfs.
Now if the non baryonic does really exist, as we think it does, then it should have mass, occupy space and must have certain volume, as the definition of matter goes. It must also be numerous. If all this true then a large part of universe may contain this dark matter, as we think it does. Today, scientists estimate that that nearly 95% of our universe is dark matter; however they are still not able to identify it or its properties.
Black holes can be a common example of dark matter. Dark matter is not visible because either it does not emit light (electromagnetic radiations) or because it does not reflect light (electromagnetic radiation). This is what a black hole does. But the problem is that detection of a black hole is not an easy task. Till now scientists have only been able to detect massive black holes in large galaxies like Milky Way and others. Only one small elliptical galaxy M32 has a black hole.
A black hole can become a massive black hole it takes a very little time. To grow bigger and bigger, the seed black hole has to swallow a lot of gas and massive stars. In fact it takes only a fraction of total time- in which the universe was formed- for a black hole to turn a more massive one, may be billions of time of the mass of our sun. In front of such a massive black hole light has no chance of escaping.
Also there are the ghostly neutrinos. They are particles belonging to the family Leptons.
Leptons:
Leptons are a family of fundamental particles that make up the matter. Leptons have six kinds of particles:
·Electrons
·Muons
·Taus
·Electron neutrino (ne)
·Muon neutrino (nµ)
·Tau neutrino (nτ)
The other families are Quarks (Down, Strange, Bottom, Up, Charm and Top) and Bosons (Photons, Gluons and Weakons or weak bosons).
Quarks combine to form yet another family Hadrons. They consist of two types of particles- Mesons and Baryons (Protons and Neutrons). Baryons make up the normal or baryonic matter.
Neutrinos were discovered by Wolfgang Pauli, in 1930. Neutrinos are so small that they do not interact with the normal matter at all. They are practically not present for us. Earth is nothing for them, transparent. Hence they can make up a small part of the dark matter.
Antiparticle and Antimatter:
All particles have their opposites. They are exactly alike the particle but they have opposite charge e.g. Positron is anti particle of electron, anti quark is anti particle of quark. Anti matter is the opposite of the particles that make up the matter. It consists of non baryonic particles, which can be considered as dark matter.
The universe, therefore, is filled with normal matter (which we know), dark matter (no clue yet, only assumptions) and dark energy (the most weird form of energy ever experienced), however it appears to have mass due to E=mc2. All these arguments also say that our universe may be a flat thing.
Well, this all about the report and let’s see what more the scientists say about dark energy and dark matter.

Answer 3

Dark matter is simply a force in the universe that can't be explained (for now) any other way.

The observations show that something else is out there.. We just don't know what it is..

Answer 4

i think dark matter is anything that is negative and never give good effects to sorroundings.